Mayweather spoke to Armstrong Williams about his upcoming fight during an in-depth discussion. While the boxer did thank other legendary boxers who have paved the way for him to be where he is, he also proclaimed himself as the best fighter ever.

"Who beat more world champions in the history of boxing? Who's number one? Who holds the record for pay-per-view?" Mayweather said. "Who they say got the best IQ? Who took the less punishment? Who was on top for 21 years? Do I have to say anything else?"

Throughout the past week, the Grand Rapids native has been on a media tour promoting the fight. The two opponents have thrown a wide variety of insults at each other during the tour. Mayweather even attempted to live up to his nickname "Money," by throwing a wad of cash at McGregor during a press conference in New York.

The multimillionaire is well known for flaunting his fortune on social media.

But the money and fame have come with a price. The IRS recently filed a federal tax lien against Mayweather saying that he owes the federal government $22.2 million in taxes from 2015. He has also been involved in three separate cases of domestic violence and served prison time in 2011 on one count of misdemeanor battery domestic violence.

Mayweather's fight against McGregor on August 26th will be available on Showtime PPV.